53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/* Generate random integers.
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Copyright (C) 2006-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Paul Eggert. */
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#ifndef RANDINT_H
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# define RANDINT_H 1
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# include <stdint.h>
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# include "randread.h"
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/* An unsigned integer type, used for random integers, and its maximum
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value. */
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typedef uintmax_t randint;
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# define RANDINT_MAX UINTMAX_MAX
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struct randint_source;
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struct randint_source *randint_new (struct randread_source *);
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struct randint_source *randint_all_new (char const *, size_t);
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struct randread_source *randint_get_source (struct randint_source const *)
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_GL_ATTRIBUTE_PURE;
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randint randint_genmax (struct randint_source *, randint genmax);
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/* Consume random data from *S to generate a random number in the range
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0 .. CHOICES-1. CHOICES must be nonzero. */
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static inline randint
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randint_choose (struct randint_source *s, randint choices)
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{
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return randint_genmax (s, choices - 1);
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}
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void randint_free (struct randint_source *);
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int randint_all_free (struct randint_source *);
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#endif
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